COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The maximum propulsion efficiency of a turbojet is attained at around following speed

1050 km/hr

2400 km/hr

1700 km/hr

550 km/hr

TRUE ANSWER : ?
YOUR ANSWER : ?

Isothermal compression efficiency, even when running at high speed, can be approached by using

Multistage compression

Cold water spray

Both (A) and (B) above

Fully insulating the cylinder

TRUE ANSWER : ?
YOUR ANSWER : ?

The assumption made in two stage compression with inter-cooler is that

There is no pressure drop in the inter-cooler

The suction and delivery of air takes place at constant pressure

All of the listed here

The compression in both the cylinders is polytropic

TRUE ANSWER : ?
YOUR ANSWER : ?

A compressor at high altitude will draw

More/less power depending on other factors

Same power

More power

Less power

TRUE ANSWER : ?
YOUR ANSWER : ?

The type of rotary compressor used in gas turbines, is of

Radial flow type

Axial flow type

Centrifugal type

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of isentropic work to Euler’s work is known as

Compressor efficiency

Isentropic efficiency

Pressure coefficient

Euler

TRUE ANSWER : ?
YOUR ANSWER : ?

In a single acting reciprocating air compressor, without clearance, the compression of air may be

Isothermal

Isentropic

Any one of these

Polytropic

TRUE ANSWER : ?
YOUR ANSWER : ?

Turbofan engine employs

Two or more air streams

Solid fuel firing

One air stream

No air stream

TRUE ANSWER : ?
YOUR ANSWER : ?

The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

(W₁ + W₂)/W₂

W₂/(W₁ + W₂)

W₁/(W₁ + W₂)

(W₁ + W₂)/W₁

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of the discharge pressure to the inlet pressure of air is called

Expansion ratio

Compressor efficiency

Volumetric efficiency

Compression ratio

TRUE ANSWER : ?
YOUR ANSWER : ?

↑